In the mid-1990s a study was conducted to determine if arthroscopic surgery was an effective treatment for arthritis of the knee.Ten men were scheduled for surgery and each patient was anesthetized.But then the surgeon consulted a randomly generated code to determine whether to do the actual surgery,or to perform a "sham" surgery (make three small incisions in the knee,stitch the patient up,and leave a small scar).This is BEST described as a(n)_____ study.
A) voluntary
B) observational
C) medical
D) experimental

Question

Quizplus · Accepted Answer

This is an experimental study because the surgeon is manipulating the independent variable (performing actual surgery or 'sham' surgery) to observe the effects on the dependent variable (treatment for arthritis of the knee).

In the Mid-1990s a Study Was Conducted to Determine If